The most beautiful and iconic section of the Glacier Express journey through the Swiss Alps is undoubtedly the Oberalp Pass and the Landwasser Viaduct. As the train climbs to its highest point at 2,033 meters (6,670 feet) at the Oberalp Pass, passengers are treated to breathtaking views of snow-capped peaks and the source of the Rhine. Another "must-see" highlight is the Rheinschucht (Rhine Gorge), often called the "Swiss Grand Canyon," where the turquoise river winds through towering white limestone cliffs. The stretch between Thusis and St. Moritz is a UNESCO World Heritage site, featuring the aforementioned Landwasser Viaduct—a spectacular 65-meter-high curved bridge that leads directly into a mountain tunnel. For the best views in 2026, book a seat in "Excellence Class" on the south side of the train to fully capture the dramatic drop-offs and the sparkling alpine glaciers as you travel between Zermatt and St. Moritz.